I set up a fresh Ubuntu 24.04.1 LTS server and installed Outline Server on it. I forwarded the necessary ports on my router: 48742 (TCP and UDP for the access key) and 15472 (TCP for management) to the Ubuntu server. From my desktop, I was able to connect to the server using the Outline Manager and successfully create a new access key.
However, when I try to connect using the Outline client, I consistently get the error: 'It seems like your access key is not valid. If this happens again, please contact the person who gave it to you.' In the Outline Manager, I can see that a small amount of data is exchanged during the connection attempt, but the connection still fails. I’ve tried different clients, locations, and networks, but the problem persists.
Is this a known bug, or what could be causing this issue?